5.2 Red Flags and Emergency Identification

Red-flag recognition is how Domain II diagnosis becomes a disposition, not a lecture. ANCC will not ask you to confirm subarachnoid hemorrhage with an office funduscopic exam. The items ask whether you stop the primary-care visit and move the patient to EMS, the emergency department, or an urgent specialty pathway. The governing rule is simple: do not delay in clinic for a confirmatory primary-care test when the syndrome is time-critical.

A clinic troponin, a next-morning Doppler, a Friday CBC, or an outpatient MRI in three days is not "being thorough" when the disease kills by the clock. It is a delay dressed up as data.

The disposition language the exam expects

Use three buckets. They are not interchangeable.

• EMS (activate 911 from the office). The patient may deteriorate in a car. Airway, shock, ACS with instability or classic ischemic features, stroke, anaphylaxis, meningococcemia, and a septic child belong here. You stay with the patient. You do not hand the parent a map to the ED.
• Same-day emergency department, safe transport if truly stable. The diagnosis needs hospital imaging, surgery, or obstetrics now, but the patient is talking, perfusing, and protecting the airway. Cauda equina, suspected torsion in a still-comfortable adolescent, and a stable but high-risk ectopic work-up often sit here — and if pain, bleeding, or vital signs worsen, you upgrade to EMS.
• Urgent specialty the same day, not "next available." A few syndromes can go straight to labor and delivery, ophthalmology (acute angle-closure), or the ED-plus-urology pathway. "I will refer you to urology next week" is not urgent specialty care for torsion.

If you are unsure which bucket, choose the faster one. ANCC does not give points for a thrifty ambulance.

Chest pain with diaphoresis, radiation, or exertion

Chest pressure in an adult plus sweating, radiation to arm, jaw, or back, or a clear exertional trigger is ACS until a hospital rules it out. Obtain an office ECG if you can do it without delaying EMS, give aspirin if it is not contraindicated and local protocol supports it, and do not wait for a point-of-care troponin to "confirm" anything. A negative clinic troponin does not exclude unstable angina. Do not diagnose costochondritis because the chest wall is a little tender.

Older adults, women, and people with diabetes may have silent or atypical ACS — nausea, isolated dyspnea, or fatigue — with the same disposition. The stem will hide the diagnosis in age plus one vital (diaphoresis counts) plus one med (sildenafil plus nitrates is a different emergency) plus one finding (an S3, crackles, or a cool, clammy skin).

Sudden severe headache and thunderclap

A headache that reaches maximal intensity in seconds (thunderclap) is subarachnoid hemorrhage until a CT, and if needed a lumbar puncture, says it is not. Sudden severe headache with neurologic deficit, syncope at onset, neck stiffness, pregnancy (think preeclampsia), or anticoagulation is the same bucket. Do not schedule an outpatient MRI in three days. Do not treat with a triptan "to see if it is migraine." Migraine is a diagnosis you make after the dangerous causes are no longer live.

Meningismus and petechiae in a child

Fever plus nuchal rigidity, photophobia, or a bulging fontanelle, especially with petechiae or purpura, is meningococcal disease until proven otherwise. Undress the child completely. Do not wait for a clinic CBC, CRP, or "a trial of antipyretics." This is EMS. Antibiotics will be given in the emergency pathway; your job is recognition and transfer, not a complete outpatient work-up. A well-appearing child with a few petechiae after vomiting is a different, narrower story — the exam child who is clinging, febrile, and spotted is not that child.

Epiglottitis signs

Drooling, tripoding, muffled "hot potato" voice, stridor, and a toxic appearance mean a threatened airway. Do not examine the throat with a tongue blade. Do not send the child to radiology unaccompanied for a "thumbprint" film. Keep the child calm, sitting with the parent, and activate EMS. Hib vaccination made classic epiglottitis uncommon; uncommon is not extinct, and rapidly progressive sore throat with drooling in an adult is still an airway emergency.

Testicular torsion is measured in hours

Acute unilateral scrotal pain, especially with nausea, a high-riding testis, or absent cremasteric reflex, is torsion until urology says it is not. Salvage falls after about 6 hours. Do not order a clinic Doppler "in the morning." Do not treat for epididymitis because the patient is 17 and sexually active — both can coexist as thoughts, only one destroys the testis this afternoon. Same-day ED with urology; EMS if the patient is writhing or vomiting. Abdominal pain in an adolescent boy without a genital exam is how torsion is missed.

Ectopic pregnancy

Amenorrhea plus unilateral pelvic pain plus a positive pregnancy test is ectopic until imaging and clinical course say intrauterine and stable. Shoulder-tip pain is referred diaphragmatic blood. Syncope, shoulder pain, or hemodynamic change is EMS, not a ride home. Do not send a first-trimester patient with unilateral pain home from clinic to "get an ultrasound when the scheduler calls back." Quantitative hCG trends are for stable, already-imaged pathways — they are not a reason to delay the first emergency evaluation.

Anyone who can be pregnant and presents with syncope, unilateral pain, or unexplained shoulder pain gets an hCG in the emergency pathway, not after a two-hour clinic wait for "confirmation."

Preeclampsia and HELLP

After 20 weeks (and up to about 6 weeks postpartum), new hypertension with headache, visual change, RUQ or epigastric pain, pulmonary edema, or laboratory hints of HELLP (hemolysis, elevated liver enzymes, low platelets) is an obstetric emergency. Primary care's job is to recognize the syndrome and move the patient to labor and delivery or the ED now. Do not start an outpatient lab panel and follow up Friday. Do not treat the headache as migraine. A BP of 168/110 in a 32-week patient with flashing lights is not a "recheck in the quiet room after she rests."

Suicidal intent, plan, and means

Ask directly. Intent plus a plan plus access to means is an immediate safety emergency. Do not leave the patient alone in the waiting room. Do not give a two-week therapy referral as the only action. Arrange ED or crisis evaluation, involve a support person if it is safe, and follow your jurisdiction's hold procedures. A PHQ-9 item 9 circled in the lobby is a screening flag, not a completed assessment — finish the assessment before discharge. Document the intent, the plan, the means, and the disposition.

Anaphylaxis

Acute allergen exposure plus respiratory compromise, hypotension, or involvement of skin plus another system is anaphylaxis. Intramuscular epinephrine in the anterolateral thigh is the first drug, then EMS. Do not "try diphenhydramine and watch for 20 minutes." Do not wait for an official allergy-clinic confirmation of the trigger. Repeat epinephrine if the first dose does not restore airway or blood pressure; antihistamines and steroids are adjuncts, not the rescue drug.

The septic child

An inconsolable infant or toddler with delayed capillary refill, mottling, tachycardia out of proportion, or altered interaction is septic until a hospital says otherwise. Fever may be absent. Do not give an intramuscular antibiotic and send the family to the car with a follow-up slot. This is EMS. Appearance beats the height of the temperature. A child who cannot be comforted by the parent, who stares through you, or whose feet stay white when you press them, is not "a hard fever to break."

Cauda equina

New saddle anesthesia, bowel or bladder retention or incontinence, bilateral sciatica, or progressive motor loss after back pain or spinal injection is cauda equina. Same-day ED for urgent MRI and spine consultation. Clinic plain films do not rule it out. Oral steroids overnight are not a plan. Ask the questions even when the opening complaint is "I threw my back out lifting."

Acute abdomen

Peritonitis — rigidity, rebound, silent abdomen, a patient who will not move — is a surgical emergency. Ectopic, appendicitis, perforation, ischemia, and ruptured AAA live here depending on age and sex. Do not give narcotics and a next-day surgical clinic card as the sole action. NPO, EMS or ED, and a phone call to receiving. An older adult with pain out of proportion to a soft abdomen is mesenteric ischemia until a hospital says it is not — another reason "reassuring exam" is not a disposition.

Stroke: FAST-ED as a concept

FAST (Face, Arm, Speech, Time) is the public screen. FAST-ED adds Eye deviation and Denial/neglect, features that raise concern for a large-vessel occlusion and can change destination to a thrombectomy-capable center. You do not need to memorize a research score for ANCC. You do need to treat sudden focal deficits as EMS, not a next-day carotid duplex. Time is brain. Do not give aspirin in clinic if hemorrhage is possible. Do not wait for an office glucose only if it delays the ambulance — hypoglycemia is on the list, but a glucometer in 30 seconds is not a 40-minute clinic work-up.

Older adults: silent ACS and afebrile sepsis

Frail and older adults omit the textbook vital. ACS may be fatigue, confusion, or dyspnea without chest pain. Sepsis may be a fall, new incontinence, or delirium without fever. A "normal" temperature does not close the infection column. Use the same red-flag dispositions you would use if the 45-year-old had crushing pain or the toddler had 40 °C — then lower the threshold further. The stem will give you age, one quiet vital (HR 118, delayed refill, new O2 of 91%), one med (anticoagulant, steroid, beta-blocker that hides tachycardia), and one finding (cool skin, new confusion).

Red flag → immediate action

If you remember only one sentence for this section: the confirmatory test for a red-flag syndrome is performed in the emergency pathway, not as a condition of leaving your office.